this morning. we are learning more about why a northern virginia man may have stageed a violent incident at johns hopkins hospital in baltimore. police say he shot a doctor, shot and killed his mother, then turned the gun on himself. this morning, that doctor is recovering and now the gunman's family says he was likely overcome with grief about his mother's condition. sherrily joins us live with more on this one. >> reporter: the doctor underwent surgery and is expected to be okay. the shooter's brother says he believes his brother was upset about surgery at johns hopkins hospital because she probably wouldn't able to walk again. police say he shot his mother yesterday morning while the surgeon updated him on the condition of his elderly mother. the wounded soldier, dr. david cohen, was shot in the and. the man barricaded himself in the room killing his mother and himself. >> my boss came running in. he said there was a guy running around with a gun and to stay put. it was scary knowing someone was on the outside on a rampage with a gun in a hospital where we're supposed to be protected.